Greg — most likely you won’t be able to activate that old version, as we’ve updated licensing to something that is more reliable (I hope that’s what people have found). We’re still on version 3.x, but you may need to download the latest update to get it working on Win 7. You could just try and see what happens, then download the update if needed from: https://www.genarts.com/support/downloads/particleillusion/standalone
If you do that you’ll need to contact support at genarts dot com though for a new serial number.
Oh, and download the bazillions of emitters that have been released since you last used it. 🙂
(On that note, I’ve got a new batch ready to release that many of you will be happy about!)
Alan.
………………..
Alan Lorence
Product Manager
GenArts, Inc.
http://www.genarts.com
http://www.wondertouch.com